Abdullah Alhaddad, Brian Bloom, Mingyang Chen, Catherine Irvine

2014-2015 PCI Big Beam Capstone Project

• National competition hosted yearly by the Pre-stressed/Precast Concrete Institute (PCI)

• Purpose of Project [1]

• Challenges students ability to design a pre-stressed concrete beam within given constraints

• Students participating in the contest will be exposed to real experience in analyzing and testing pre-stressed/precast beams through application of their education.

Introduction

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• Normal concrete tensile strength: 8-14% of compressive strength

• Cracks develop early in life cycle of structure

• Pre-stressed concrete extends life of structure prior to crack

• After service load cracks, behaves essentially the same as OPC

• Pre-compresses tension zone of a beam to counter tension

Background: Pre-stressed Concrete [2]

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• Design of a pre-stressed concrete beam

• Maximum simply supported span of 17 ft

• Maximum length of 19 ft

• Load requirements

• Must crack above 20 kips

• Must fail between 35 and 40 kips

• Design judged for lowest weight, lowest cost, and maximum deflection

• Will perform calculations, predictions, testing, and analysis

• Accuracy of predictions will also be judged

Project Description [3]

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Dr. Robin Tuchscherer

• Technical Advisor & Client

• Manufacturer of beam

• Contest host and judge

Client & Stakeholders

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• Project Manager – Catherine IrvineResponsible for communication outside of the team; dealing with the client, technical advisor, and beam manufacturer. Schedules group meetings, ensures all tasks are completed on time.

• Writing Editor – Abdullah AlhaddadResponsible for quality assurance in all deliverables for the project; also responsible for the project website.

• Engineering Analysts – Mingyang Chen & Brian BloomResponsible for all calculations and analysis of beam options and the final design. The engineering analysts will review mix designs, test data, and predict final loads.

Staffing Plan

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• Task 1: Project Understanding & Research

• 1.1: Understand Technical Requirements

• 1.2: Understand Competition Rules

• 1.3: Tpac Plant Visit

• Task 2: Technical Details & Design

• 2.1: Learn basics of pre-stressed design

• 2.2: Initial Designs

• Task 3: Calculations in Mathcad

• 3.1: Learn to use and setup Mathcad

• 3.2: Calculations

• Task 4: Final Design

• 4.1: Decision Matrix

• 4.2: Shop drawings

Scope of Services

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• Task 5: Predictions in Response2000

• 5.1: Cylinder Tests

• 5.2: Predictions

• Task 6: Testing & Analysis

• 6.1: Test setup

• 6.2: Testing

• 6.3: Analysis

• Task 7: Project Managemeng

• 7.1: Application Form

• 7.2: Website

• 7.3: Final Report

• 7.4: UGRADS Presentation

• Task 8: Evaluate Broader Impacts of Design

• 8.1: Evaluate Impacts

Scope of Services

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• Fabrication (done by Tpac)

• Travel except between Flagstaff & Phoenix, AZ

• Shipping from manufacturer to Flagstaff

Exclusions

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Schedule

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Classification Hours* Billing Rate ($/hr) Cost

I. Personnel Project Manager 192 110 $21,120

Writing Editor 168 86 $14,448

Engineering Analyst #1 196 100 $19,600

Engineering Analyst #2 196 100 $19,600

Total $74,768

II. Travel 2 trips to Phoenix @ 286 mi/trip

$0.56/mi [4]

$320.32

III. Subcontract

Tpac Kiewit Western Co.

$5000**

IV. Total $75,088.32

* 8 hours per typical work day x total number of days for each position

**current estimate

Cost of Services

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Questions

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[1] PCI. (n.d.). Retrieved September 17, 2014, from http://www.pci.org/

[2] Nawy, Edward G. Prestressed Concrete: A Fundamental Approach. 5th ed. Upper Saddle River, N.J.: Prentice Hall, 2010. Print.

[3] PCI. Big Beam Contest 2015: Official Rules for the PCI Engineering Design Competition. 2014. PDF file.

[4] IRS (Nov 5, 2014)). Retrieved November 19, 2014 from http://www.irs.gov/2014-Standard-Mileage-Rates-for-Business,-Medical-and-Moving-Announced

References

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